Sainteknol : Jurnal Sains dan Teknologi最新文献

Production of Liquid Soap from Virgin Coconut Oil with the Active Ingredient Citronella Oil 用含有有效成分香茅油的初榨椰子油生产液体肥皂

Sainteknol : Jurnal Sains dan Teknologi Pub Date : 2023-06-28 DOI: 10.15294/sainteknol.v21i1.44060

P. A. Handayani, Didit Rizky Aditiya, Jannatin Ockta Almaidah

引用次数: 0

The Potential of Earthworms (Eudrilus eugeniae) in Vermicompost Production from Vegetable Market of Waste Cabbage and Fruit Skins eugenae蚯蚓在废白菜、果皮菜市场蚯蚓堆肥中的应用潜力

Sainteknol : Jurnal Sains dan Teknologi Pub Date : 2023-06-16 DOI: 10.15294/sainteknol.v21i1.43485

I. N. Pradnya, N. A. Imani, M. Kusumaningrum, H. Ardhiansyah, Devina Dwiyuanita Nugraha, Amaliya Fairuz Syakila

{"title":"The Potential of Earthworms (Eudrilus eugeniae) in Vermicompost Production from Vegetable Market of Waste Cabbage and Fruit Skins","authors":"I. N. Pradnya, N. A. Imani, M. Kusumaningrum, H. Ardhiansyah, Devina Dwiyuanita Nugraha, Amaliya Fairuz Syakila","doi":"10.15294/sainteknol.v21i1.43485","DOIUrl":"https://doi.org/10.15294/sainteknol.v21i1.43485","url":null,"abstract":"Traditional markets are one of the highest contributors to waste. Traditional markets can produce a lot of waste, one of the wastes with a large amount is organic waste. The alternative that can be done to deal with organic waste and can be converted into a product is to make compost using the vermicompost method. The aim of this study was to find out the length of time for composting in the manufacture of compost, to determine the optimal amount of Eudrilus eugeniae in the composting process, and to find out the optimal distribution of waste in composting. The incubation process for compost was carried out for 8 weeks, with sampling at weeks 4, 6, and 8. Sampling was carried out to analyze the macronutrient content consisting of C-Organic, nitrogen, and potassium. Content analysis was carried out using UV/VIS spectrophotometry for analysis of C-Organic content, Kjeldahl method for nitrogen content analysis, and Atomic Absorption Spectrophotometer (AAS) for potassium content analysis. The specifications for compost from organic waste are based on the Indonesian National Standard (SNI 19-7030-2004). This research resulted in C-Organic content of 6.1-8.1%, nitrogen content of 0.32-0.43%, and potassium content of 0.16-0.23%.","PeriodicalId":231562,"journal":{"name":"Sainteknol : Jurnal Sains dan Teknologi","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114941740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Heavy Metal Content in Lola Snail (Trochus niloticus) in The Karang Island of Central Tapanuli Regency 中塔巴努里县卡朗岛洛拉螺(Trochus niloticus)重金属含量研究

Sainteknol : Jurnal Sains dan Teknologi Pub Date : 2023-06-16 DOI: 10.15294/sainteknol.v21i1.43387

Aisyah Umi Ramadhani Samosir, Rahmatsyah Rahmatsyah, R. Juliani

{"title":"Study of Heavy Metal Content in Lola Snail (Trochus niloticus) in The Karang Island of Central Tapanuli Regency","authors":"Aisyah Umi Ramadhani Samosir, Rahmatsyah Rahmatsyah, R. Juliani","doi":"10.15294/sainteknol.v21i1.43387","DOIUrl":"https://doi.org/10.15294/sainteknol.v21i1.43387","url":null,"abstract":"Research on the analysis of heavy metal content in the waters of Karang Island, Central Tapanuli Regency aims to know the metal content in Lola Snail meat, sediment, and Lola Snail shells. The research method begins with taking samples of Lola snails and sediments on Karang Island and preparing the samples. Then, the samples were analyzed by AAS (Atomic Absorption Spectrometry) to determine the content of heavy metal elements in the meat of Lola Snail, followed by XRD (X-Ray Diffraction) testing to determine the content of heavy metal elements in sediments, and also testing with EDX (Energy Dispersive X-Ray) to determine the content of heavy metals in the shell. The results of the analysis on the AAS test showed that the order of heavy metal concentrations in Lola snail meat at station I was Zn Cr Cu Cd Pb, while at station II was Zn Cu Cr Cd Pb. The results of the sequence of heavy metal concentrations using XRD in sediments around Karang Island at the station I was Zn Cr Cu Cd Pb, while at station II was Zn Cd Cu Cr Pb. The results of the analysis on the shells of Lola snails using EDX at both stations showed they did not contain heavy metal elements (Pb, Cd, Cu, Cr, and Zn), but only contained O, Ca, Mg, Na, Al, and Si elements.","PeriodicalId":231562,"journal":{"name":"Sainteknol : Jurnal Sains dan Teknologi","volume":"506 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117037077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetic Modelling of Liquid-Solid Extraction of Bioactive Compounds from Ginger Waste using Subcritical Water 亚临界水萃取姜渣中生物活性物质的动力学模拟

Sainteknol : Jurnal Sains dan Teknologi Pub Date : 2023-06-16 DOI: 10.15294/sainteknol.v21i1.44589

M. E. Yulianto, B. Jos, B. Budiyono

{"title":"Kinetic Modelling of Liquid-Solid Extraction of Bioactive Compounds from Ginger Waste using Subcritical Water","authors":"M. E. Yulianto, B. Jos, B. Budiyono","doi":"10.15294/sainteknol.v21i1.44589","DOIUrl":"https://doi.org/10.15294/sainteknol.v21i1.44589","url":null,"abstract":"Kinetic modelling played a key role in the development of subcritical water extraction for bioactive compounds such as: shogaol and gingerol from ginger waste. Liquid-solid extraction kinetics could predict the extraction phenomenon and increase the efficacy of extraction process. The aim of this study was to develop a mathematical model of leaching kinetics and determine the rate constant of extraction process (k) of shogaol and gingerol in ginger pulp which is in the subcritical water phase. The research was carried out in two work stages, namely modeling and experimentation. The modeling was done by comparing three extraction kinetic models, namely pseudo first order, pseudo second order and the distribution coefficient. The model was postulated and validated with experimental data using Matlab. The subcritical water extraction process of shogaol and gingerol in ginger waste was occurred at 140 ℃ with a pressure of 3.5 bar. The extracts had been separated from raffinate and further analyzed using HPLC-MS. The results showed that the pseudo first order kinetic model described well the phenomenon of subcritical water extraction with regression values was 0.9882 for gingerol and 0.9682 for shogaol respectively. The rate constant of extraction process (k) for gingerol and shogaol were 0.1101 and 0.3130 , respectively. This showed that the shogaol extraction rate was higher than the gingerol extraction rate.","PeriodicalId":231562,"journal":{"name":"Sainteknol : Jurnal Sains dan Teknologi","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116069056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Behavior and Kinetic of Degradation of PVA and PVA/CS/AL Blend PVA及PVA/CS/AL共混物的热行为及降解动力学

Sainteknol : Jurnal Sains dan Teknologi Pub Date : 2023-06-09 DOI: 10.15294/sainteknol.v21i1.42675

Retno Wulandari, Y. A. Swasono, Muchamad Zain Nur Ichsan, A. Rifathin

{"title":"Thermal Behavior and Kinetic of Degradation of PVA and PVA/CS/AL Blend","authors":"Retno Wulandari, Y. A. Swasono, Muchamad Zain Nur Ichsan, A. Rifathin","doi":"10.15294/sainteknol.v21i1.42675","DOIUrl":"https://doi.org/10.15294/sainteknol.v21i1.42675","url":null,"abstract":"Studying thermal behavior, especially regarding the kinetics of the degradation of materials has attracted attention in this recent years because it can provide information about the stability of materials in various conditions and how the mechanism of material degradation. In this research, the thermal behavior and kinetics of thermal degradation of polyvinyl alcohol (PVA) and polyvinyl alcohol (PVA)/cassava starch (CS)/alkaline lignin (AL) with glycerol as a plasticizer were investigated and compared by the thermogravimetric analyzer. The test was carried out for samples under non-isothermal conditions in nitrogen at a single heating rate of 10 °C/min. The activation energies were calculated using Coats-Redfern, Broido, and Horowitz-Metzger methods. The results showed that PVA/0 and PVA/CS/AL had four decomposition steps with the main degradation of PVA/0 and PVA/CS/AL in the second and third decomposition steps. The first degradation of PVA/0 and PVA/CS/AL occurred at 125 °C - 270 °C with a decomposed mass of 35.94%, and 135 °C – 250 °C with a decomposed mass of 31.84%, respectively. The second degradation of PVA/0 and PVA/CS/AL was at 270 °C - 385 °C with a decomposed mass of 40.33% and 250 °C – 395 °C with a decomposed mass of 38.62%. The values of activation energies using Coats-Redfern, Broido, and Horowitz Metger methods of PVA/0 were 57.08 KJ/mol, 64.82 KJ/mol, and 70.57 KJ/mol, respectively. The values of activation energies using Coats-Redfern, Broido, and Horowitz Metger methods of PVA/CS/AL were 74.49 KJ/mol, 82.17 KJ/mol, and 95.65 KJ/mol, respectively. The lower activation energy indicates that degradation reactions occur more easily. PVA/CS/AL has slightly better thermal stability than PVA/0.","PeriodicalId":231562,"journal":{"name":"Sainteknol : Jurnal Sains dan Teknologi","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121514450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0